I Receive Ivig Q6 Wks For Cvid, Headache Is Awful,

I receive ivig q6 wks for cvid, headache is awful, so it is run slow, recently,headache are now awful and not only after / during IV. I've bee receiving this for 1 1-2 yrs,,,, Doctor says its old age headache? Had my eyes checked they are good. MRI od brain good. Headaches so bad even my hair hurts